UVA11103 WFF 'N PROOF

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=23&page=show_problem&problem=2044 [PDF](https://uva.onlinejudge.org/external/111/p11103.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11103/dddead7183864b94e52c10ea21497f0593b4ef51.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11103/8a531dbcadd3bbf8e7f65626df5a9855faabd521.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11103/646b3e570396b0238c0c1fe1b17e5a33a14e8e9c.png)